Experts..... Please help...... a are ercel'en'ly preøared. tour wetl-veoared
are a•oecuateij and one poorly prepared There are 20
A SluOen' wnc was excellently prepared can answer ad
20 who was well prepared can answec 16 questions. a student
Orwared can answer 10 questions arid a student who was
can answer only 5 questions A squrJen! was called at random ano answerers
aro•tranrj' questions. F•nd the probabdity that the student was
f") poorly prepared
